Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef681cbcfce8c208…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 05:43:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9910804ac236f21f9b0d42a15196f434 SHA-1: 81611095cc2168c820b8f9319ebda13bb1c95e61 SHA-256: ef681cbcfce8c20841549954175c7e71c04828eed8897faf5c3e9513bf281b23
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to websites offering game hacks and generators, such as 'minecraft-windows-10-key-free-game-hack'. The heuristic firings confirm that the PDF links to a game hack redirector and that the ML classifier flagged it as malicious. The document body, though heavily corrupted, contains references to these lures and additional URLs, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.online/app/479516143/minecraft-windows-10-key-free-game-hack PDF link annotation
    • http://www.hlad.hr/files/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/minecraft-cracked-client_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/what-is-wurst_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/is-coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/minecraft-launcher-download-free_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/tiktok-likes-free_GM835599320.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-ban_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005069.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5069 25376 bytes
SHA-256: 02dd647b127c8409ad6df38f9523315a8b1a4b9c5f880d6b784e83dbea7364f9
font_01_sfnt_off000089f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89F8 18704 bytes
SHA-256: a36dfd25d96361324b643dcf25d0bbe587ae4faa1fc7994e7ccdab15621c1fe2

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